Anyone ever play Electrocity? It is a short, easy, online, turn-based city simulation game, that scores you on a percentile system in several categories. It is easy to get a high percentage in any category, but a challenge to do well in them all in one game.
Your city's population all resides in the center square, and it is your job to develop the rest of the city to provide power, recreation, and other things to help your city grow. Everything has its costs, though, so you'll have to decide carefully. There are only 150 turns (before each of which you can do your mayoring) and it takes a while to appropriate enough tax dollars from your poor citizens' pockets to do anything fast.
There are no free rides, either - everything has its pros and cons, and there are tradeoffs to consider. If you raise taxes (by default at 25% already) you'll lower the happiness in your city, and ultimately lose points from your final score. It is graded like school, A=90%, and once you're trying to improve on 90, every little thing can cost you a point. I have never been able to get a perfect A in both population and power - the needs for A level population, and the things that attract them, take a lot of power, which will cost your environment some points if even if you manage to produce enough power.
Its not nearly as involved as Sim City, but its fun when you don't have enough time to get into SC, or if you are at a different computer. My best final score is a 95 I think, but others have done better, and anything over 90 is a great score. If you play it, post your best score here, and how you did it.